Ultra violet photoelectron spectroscopy

The UPS technique (ultra violet photoelectron spectroscopy), by measuring the cutoff energy of secondary electrons.56,57... 

Significant observations regarding the origin of NEMCA have been also made using Ultra-violet Photoelectron Spectroscopy (UPS) with Pt and Ag electrodes deposited on YSZ. In this case the work function of the electrode can be determined from the cutoff energy of secondary electrons (Fig. 5.43).24,68 As shown in Fig. 5.8b the change in the work function of the gas-exposed Ag surface is very close to the imposed electrode potential change AUwr. 

Barrie, A. In "Handbook of X-ray and Ultra-Violet Photoelectron Spectroscopy", Briggs, D., Ed. Heyden London, p. 116. 

ESCA UPS SIMS STM IR UV electron spectroscopy for chemical analysis ultra-violet photoelectron spectroscopy secondary ion mass spectroscopy scanning tunneling microscopy infra-red ultra-violet... 

Systems" in Handbook of X-ray and Ultra-Violet Photoelectron Spectroscopy, Ed. D. Briggs, Heydon Son Ltd., London 1977. 

Tompkins (1978) concentrates on the fundamental and experimental aspects of the chemisorption of gases on metals. The book covers techniques for the preparation and maintenance of clean metal surfaces, the basic principles of the adsorption process, thermal accommodation and molecular beam scattering, desorption phenomena, adsorption isotherms, heats of chemisorption, thermodynamics of chemisorption, statistical thermodynamics of adsorption, electronic theory of metals, electronic theory of metal surfaces, perturbation of surface electronic properties by chemisorption, low energy electron diffraction (LEED), infra-red spectroscopy of chemisorbed molecules, field emmission microscopy, field ion microscopy, mobility of species, electron impact auger spectroscopy. X-ray and ultra-violet photoelectron spectroscopy, ion neutralization spectroscopy, electron energy loss spectroscopy, appearance potential spectroscopy, electronic properties of adsorbed layers. 

While molecular and dissociated CO have similar X-ray photoelectron spectroscopy spectra, 0(ls) at 531 eV and C(ls) at 285 eV [245, 427, 431], the ultra violet photoelectron spectroscopy [245, 427] and laser Raman [432] spectra are different. 

Ultra violet photoelectron spectroscopy N(ls) peaks are found at — 12 and — 8 eV [462]. At 85 K X-ray photoelectron spectroscopy N(Is) peaks are found at 405.9 and 401.2 eV [462, 463]. High resolution electron energy loss spectroscopy shows a N-N stretch in yN2 at 2100 cm [231]. For N2 the work function decreases linearly with the coverage up to saturation [22]. 

During adsorption of N2H4 on Fe(l 11), the tendency of dissociate is great. At 126 K ultra violet photoelectron spectroscopy shows the presence of N2H4 after 0.5 L exposure [550] condensation is detected at 80 L, 126 K [550]. At 220 K ultra violet photoelectron spectroscopy and X-ray photoelectron spectroscopy detect N2H4 and NH after 31 of exposure [550]. A 550 K N is formed during exposure [550]. 

Auger electron spectroscopy and ultra violet photoelectron spectroscopy of O2 chemisorption at 77 K on Fe have shown that the formation of oxide may be followed by the formation of molecularily adsorbed O2 [476]. Evidence for the adsorption molecular O2, even in the absence of oxide, has come from X-ray photoelectron spectroscopy spectra for O2 adsorbed on single crystal surfaces, where a peak at — 533.6 eV is interpreted as the molecular precursor [560]. 

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